MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Low Springback and Low Young’s Modulus in Ti–29Nb–13Ta–4.6Zr Alloy Modified by Mo Addition
Qiang LiQiang QiJunjie LiMasaaki NakaiMitsuo NiinomiYuichiro KoizumiDaixiu WeiKenta YamanakaTakayoshi NakanoAkihiko ChibaXuyan LiuDeng Pan
Author information
JOURNAL FREE ACCESS FULL-TEXT HTML

2019 Volume 60 Issue 9 Pages 1755-1762

Details
Abstract

Deformation-induced higher Young’s modulus can satisfy the contradictory requirements of Ti alloys for spinal-fixation applications, which demand a high Young’s modulus to reduce springback during operations and a low Young’s modulus to prevent stress shielding effect for patients after surgeries. In this study, TNTZ–(1, 3, 5)Mo are designed by adding Mo and Ti to Ti–29Nb–13Ta–4.6Zr (TNTZ) in order to maintain low initial Young’s modulus and achieve low springback. All the solutionized alloys show single β phase with increasing the β stability by Mo addition. They show low Young’s moduli less than 65 GPa, similar ultimate tensile strength of 650 MPa and elongation around 20%. The springback of TNTZ–3Mo and TNTZ–5Mo is lower than that of TNTZ and TNTZ–1Mo owing to their more stable β phase. After cold rolling, TNTZ–3Mo shows the largest increasing ratio of 25% in Young’s modulus and the highest ultimate tensile strength owning to the appearance of deformation-induced ω phase. With the low initial Young’s modulus of 59 GPa, TNTZ–3Mo is a potential candidate to make the spinal rods in spinal fixation devices.

Fullsize Image
Content from these authors
© 2019 The Japan Institute of Metals and Materials
Previous article Next article
feedback
Top